Union Sanitary District (USD) recently received the "Large Collection System of the Year" award from the San Francisco Bay Section of the California Water Environment Association (CWEA). The District received the award for outstanding performance in 2011 in the categories of regulatory compliance, maintenance, safety, training, emergency preparedness and administration for sewer systems of 500 miles or more. USD owns and maintains over 779 miles of sewer lines in the Tri-Cities.

USD's proactive evaluation of its main sewer line preventative maintenance program was among its 2011 accomplishments, as well as additions to its technical training facilities at the District's headquarters in Union City.

The Bay Section award automatically enrolls the District in CWEA's statewide competition. CWEA is the California industry association for wastewater professionals, with about 9,000 members statewide and over 1,600 in the San Francisco Bay section, which includes Alameda, Contra Costa, and San Francisco Counties and part of San Mateo County. USD won CWEA's Statewide Awards for Large Collection System of the Year and Large Treatment Plant of the Year for 2009.

Union Sanitary District operates a 30 million gallon per day wastewater treatment facility in Union City and provides collection, treatment and disposal services to the cities of Fremont, Newark and Union City.